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    * {
      margin: 0;
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    }
    .box {
      /* width: 750px; */
      height: 200px;
      background-color: red;
    }
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<body>
  <div class="box">
    
  </div>
  <script>
    console.log(document.querySelector('.box').innerHTML = window.innerWidth)
    let objA = {
      a: '第3',
      b: '颈椎',
      c: '左侧棘突',
      d: '完全骨折'
    }

    let objB = {
      a: '第5',
      b: '颈椎',
      c: '锥弓',
      d: '完全骨折'
    }

    function getReport(arr) {
     let temp =  _.groupBy(arr, (e) => {
       return [e.a, e.b, e.c].join('/')
     })

     console.log(temp)
    }

    getReport([objA, objB])
  </script>
</body>
</html>